8.2. Chroot

If you want to chroot in a generated image, then there are few thing
you should be aware of:

you should setup the new root from the tar root filesystem image;

either the selected target architecture is compatible with your host
machine, or you should use some qemu-* binary and correctly set it
within the binfmt properties to be able to run the binaries built
for the target on your host machine;

Buildroot does not currently provide host-qemu and binfmt
correctly built and set for that kind of use.